To center a layer while copying it to another document, drag from the layers palette to the other document, but hold the Shift key down while releasing the mouse button. If both documents have identical dimensions, instead of centering, the copied layer will be placed in the exact same position.
Photoshop Layers & Blend Modes
Compatibility: Photoshop 6 and higher, Photoshop Elements
Submit your Tips!
Got some gems of your own you'd like to share with other users? Submit them to the site and if your tip is used, you'll get the credit!